Grinding machine



R. SIEFERTSON.

GRINDING MACHINE.

APPLICATION FILED MAY 18, 1920.

1A1 Q3? 1 5 a Patented Apr- 111, 1922 2 SHEETSSHEET xNvEm'oR ATTORNEY R. SIEFERTSON GRINDING MACHINE.

APPLICATION FILED MAY H1. 1920.

1,11 8,? 1 5D Patented Apr. 11, 1922.

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INVENTOR 54mm. r) w j j WITNESS:

ATTORNEY RICHARD SIEIEERTSON, 0F MENAHGA, MINNESOTA.

eniunrue MACHINE.

Application filed May 18,

To all whom it may concern:

Be it known that I, RICHARD SIEFER'rsoN, citizen of the United States, residing at Menahga, in the county of Wadena and State of Minnesota, have invented new and useful Improvements in Grinding Machines, of which the following is a specification.

This invention relates to grind1ng machines and has for an object the provision of a machine which is especially adapted for use upon large and cumbersome work.

For this purpose, the machine comprehends the provision of a rotatably supported head, which carries one or more. grinding or polishing wheels which may be revolved to bring the grinding or polishing wheels into contact with the work with the minimum amount of time and labor.

Another object is the provision of a machine of this character, which is simple of construction and operation and which may be manufactured at a low cost.

lVith the above and other objects in View, the invention further includes the follow-' ing novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the appended claims.

In the drawings Fig. 1 is a side elevation of a grinding machine embodying the present invention.

Fig. 2 is a top plan view of the same.

Fig. 3 is an end view of the machine.

Fig. 4 is a section on the line 44 of Figure 2.

Referring specifically to the drawings, wherein like characters of reference denote corresponding parts, the machine comprises a support which includes standards 10, which may besuitably connected together at their lower ends, or may be bolted or otherwise secured to the floor 11. The standards 10 are connected at their top ends bymeans of a table or platform 12, the latter being shown of circular form and being provided with a central opening 13. I

Extending through the opening 13 is a rotatably mounted vertically disposed shaft 14, the latter being provided near its lower end with a beveled pinion 15, which is engaged by a similar pinion 16. This last mentioned pinionis mounted upon a horizontally disposed shaft 17, having bearings in the standards 10 and being provided with .Specificatimi of Letters Patent.

Patented Apr. 111, 1922..

1920. Serial No. 382,437.

17 for the purpose of operating the shaft 14.

The shaft 14 extends upward through a rotatably mounted grinding head 20. This head is of elongated configuration and is supported at each end upon rollers for other anti-friction devices 21, which operate over the table 12 by means of which it may be freely rotated about the shaft 14. Rotatably mounted in the head 20 is a horizontal shaft 22 upon which is secured a beveled pinion 28, which is driven from a beveled gear 24 secured upon the shaft 14. The shaft 22 carries grinding and polishing wheels 25 and 26.

Secured to the grinding head 20 is one end of a laterally extending arm 27, the outer end of which extends beyond the periphery of the table 12 and carries a dog 28, which is operated by a spring actuated hand lever 29. This dog extends through the arm 27 for engagement with spaced sockets or depressions 30, the latter being spaced inwardly a slight distance from the edge of the tabletop.-

Power from any source may be applied to the shaft 17 for the purpose of operating the wheels 25 and 26 and the grinding head may during this operation be rotated to a suitable position for contact with the work. It will be held against accidental movement in this position through the medium of the dog 28, which may be easily and quickly released through the medium of the hand lever 29 when it is again desired to move the grind head.

The invention is susceptible of various changes in its form, proportions and minor details of construction and the rightis herein reserved to make such changes as properly fall within the scope of the appended claims.

Having described the invention what is claimed is 1. A grinding machine comprising a sup port including a table or platform, a vertical shaft extending through the platform, a head mounted for rotation upon the table or platform about the shaft, a horizontal shaft mounted in said head and operated from the vertical shaft, a grinding wheel carried by the horizontal shaft, anti-friction devices carried by the head and contacting with the table or platform for supporting the former and means for holdingthe head against rotary movement.

2. A grinding machine comprising a sta- 5 tionary support, a head mounted for rotation thereon, a shaft revolubly mounted in the head, a grinding Wheel carried by the rotation Y RICHARD SIEFERTSON.

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